84. Calvin, W.M., and R.N. Clark,
1993, Spectral Distinctions between the Leading and Trailing
Hemispheres of Callisto: New Observations: Icarus,104, 69-78.

85. King, T.V.V., and Clark, R.N.,
1993, Defining the effects of matrix interactions with selected
organic compounds using visible, near and mid-infrared spectroscopy:
Sensors for the U.S. Army Environmental Center Site Characterization
and Analyses Penetrometer System (SCAPS), May 11-13, 1993, Denver, CO, 2p..